Server Configuration

Hi all, I am a new member to this forum and I find this quite interesting. I have a question in the configuration of HTTP Server. I have installed a new Application Server eg. TESTAPP in the Admin Console and set the directory structure also for this in WAS 3.5. If I have a folder named IMAGES inside TESTAPP , I always need to reference it in the format /TESTAPP/IMAGES since "/" specifies the Default-host. How do I set up TESTAPP as the root so that when I specify /IMAGES, it points to /TESTAPP/IMAGES and not from the DEFAULT-HOST directory.